[TenTec] High speed washer hum/whine

[Paul Christensen]

>Since the washer is a newer type and it has been plugged in (we assume)
> properly, the idea of grounding issues only serves to discuss the possible 
> means
> of coupling the generated source (from the Dryer) into the radio...Believe 
> it or not, they may
> be having a violation of FCC Part 15 regarding their electronics.

"Appliances" are exempt from FCC certification under Part 15.103(d).

"Sec.  15.103  Exempted devices.

(d) A digital device utilized exclusively in an appliance, e.g.,
microwave oven, dishwasher, clothes dryer, air conditioner (central or
window), etc."

The intervention to resolve the problem only manifests when the Part 15 
device causes interference to a licensed service.  But a manufacturer of an 
appliance with digital and switch-mode electronics is not compelled to 
affirmatively certify a device deemed an "appliance."

The relevant section in Part 15 was last modified at a time when computers 
and switch-mode power supplies had not yet taken over our ovens, coffee 
makers, washers, dryers and refrigerators.  Part 15 is badly in need of an 
update to address modern appliances.

Paul, W9AC